Voltage Vs Peev Xwm hauv Lithium roj teeb: Dab tsi yog qhov txawv

Ntawm GEB, peb tsim cov roj teeb lithium rau cov ntawv thov tiag - ntiaj teb txhua hnub. Cov neeg siv khoom feem ntau nug peb tias vim li cas lub roj teeb nyeem 3.8V ib pliag thiab poob sai sai hauv kev thauj khoom, txawm tias nws tseem tshuav nqi ntau. Qhov tsis meej pem yuav luag ib txwm los rau tib yam: sib xyawvoltage thiab muaj peev xwm.

Ob tus lej no piav qhia txog txhua yam sib txawv, tab sis lawv ua haujlwm ua ke los txiav txim siab seb koj lub roj teeb tuaj yeem ua tau npaum li cas. Cia peb tawg kom meej meej kom koj tuaj yeem txiav txim siab zoo dua thaum xaiv lossis siv cov roj teeb lithium.

Qhov Voltage thiab Capacity tiag txhais tau li cas

Qhov hluav taws xobyog qhov hluav taws xob siab sib txawv ntawm qhov zoo thiab qhov tsis zoo ntawm lub xov tooj ntawm tes. Nws qhia koj tias lub roj teeb muaj zog npaum li cas tuaj yeem thawb electrons los ntawm lub voj voog. Hauv kev xyaum, peb tham txog peb qhov tseem ceeb voltage qhov tseem ceeb:

• Nominal voltage(qhov nruab nrab ua haujlwm voltage, xws li 3.2V rau LiFePO4 lossis 3.7V rau NMC)
• Them txiav- tawm voltage(feem ntau yog 4.2V rau feem ntau Li-ion cells)
• Tso tawm txiav- tawm qhov hluav taws xob(feem ntau 3.0V lossis 2.5V nyob ntawm chemistry)

Muaj peev xwm, ntawm qhov tod tes, ntsuas tag nrho cov nqi them lub roj teeb xa tuaj, qhia hauv ampere -hours (Ah) lossis milliampere- teev (mAh). Lub roj teeb 100Ah tuaj yeem muab 100 amps rau ib teev, lossis 10 amps rau kaum teev, ua ntej nws khoob.

Lub zog tiag tiag muaj los ntawm kev sib txuas ob qho tib si:

Zog (Wh)=Voltage × Capacity

Piv txwv li, 48V 100Ah roj teeb pob khaws 4.8 kWh ntawm lub zog. Qhov no yog tus lej uas qhia tau hais tias koj lub hnub ci zog, lub forklift, lossis lub zog hluav taws xob tuaj yeem khiav ntev npaum li cas.

Ntau tus neeg tsuas yog saib ntawm qhov hluav taws xob ntawm lub tshuab hluav taws xob thiab xav tias lub roj teeb yuav luag tuag thaum nws poob qis dua 3.7V. Hauv kev muaj tiag, qhov kev nyeem ntawv feem ntau txhais tau hais tias lub roj teeb tseem muaj 40-60% lub peev xwm sab laug, nyob ntawm qhov load thiab chemistry.

Yuav ua li cas Voltage thiab Peev Xwm cuam tshuam rau ib leeg

Voltage thiab muaj peev xwmtsis ywj pheej. Qhov voltage koj ntsuas hloov thaum lub roj teeb tso tawm nws cov nqi khaws cia. Qhov kev sib raug zoo no yog tsav los ntawm kev txav ntawm lithium ions ntawm cov electrodes thiab cov txiaj ntsig tshuaj lom neeg.

Hauv cov ntsiab lus yooj yim, thaum lub roj teeb tawm, lithium ions tawm ntawm lub anode thiab txav mus rau cathode. Qhov ntsuas tauqhib- Circuit Court voltage (OCV)yog qhov sib txawv ntawm qhov muaj peev xwm ntawm ob lub electrodes. Raws li qhov concentration ntawm lithium ions hloov, qhov voltage maj mam poob.

Txawm li cas los xij, qhov kev poob qis no tsis tshua muaj linear. Feem ntau ntawm lub peev xwm raug xa tawm thaum lub sijhawm ua haujlwm ncaj nraim "voltage platform." Thaum lub platform xaus, qhov hluav taws xob poob qis mus rau qhov kev txiav -tawm taw tes. Qhov no tsis yog - tus cwj pwm linear yog vim li cas kev cia siab rauvoltage ib leegkwv yees qhov seem khiav ua rau yuam kev.

Ntawm GEB peb pom qhov no txhua zaus peb kuaj pob. Ib lub xovtooj ntawm tes yuav zaum tau yooj yim ntawm 3.65V rau lub sijhawm ntev thaum tseem xa cov feem ntau ntawm nws qhov ntsuasmuaj peev xwm.

Nkag siab txog qhov Discharge Curve

Covtshem tawm nkhausqhia raws nraim li cas voltage coj raws li lub peev xwm siv. Ib qho lithium roj teeb nkhaus muaj peb theem sib txawv:

Pib poob los ntawm kev them tag nrho voltage

Ntev, kuj tiaj tus platform uas feem ntau muaj peev xwm xa

Lub hauv caug ntawm qhov kawg thaum qhov hluav taws xob poob sai sai kom txiav - tawm

Ntawm no yog ib tug tswv yimvoltage vs SOC roojrau tus qauv NMC cell nyob rau hauv cov xwm txheej sib txawv (kuaj ntawm 25 degree):

Daim ntawv ceeb toom yuav ua li cas qhov voltage nyob rau hauv load yog ib txwm qis dua qhov qhib - voltage voltage. Kev tawm tam sim no ntau dua ua rau muaj hluav taws xob ntau dua vim muaj kev tiv thaiv sab hauv thiab cov teebmeem polarization.

Ntau yam hloov pauv qhov nkhaus no hauv kev siv txhua hnub:

• Siab dua C- tus nqi → ua ntej thiab tob zog poob
• Tsawg kub → txo voltage thiab muajmuaj peev xwm
• Tus nqi ntau dua - tso tawm mus → platform maj mam txo qis thiab flattens tsawg dua

Qhov no yog vim li cas lub roj teeb uas ib zaug khiav rau 8 teev ntawm tib qhov hluav taws xob yuav tsuas kav 6 teev tom qab 500 cycles.

LiFePO4 vs NMC: Ntau qhov voltage thiab muaj peev xwm coj tus cwj pwm

Cov chemistry koj xaiv hloov covvoltage-kev sib raug zootxaus ntshai.

LiFePO4 (LFP)hlwb khiav ntawm nominal 3.2V nrog ib tug heev tiaj tustso tawm platform. Voltage nyob twj ywm zoo kawg li ruaj khov ntawm kwv yees li 3.3V thiab 3.0V rau feem ntau ntawm lub peev xwm. Qhov flatness no muab koj lub sijhawm ua haujlwm tau zoo dua thiab muaj peev xwm siv tau zoo dua hauv kev siv tiag. LFP yog qhov kev xaiv zoo tshaj plaws rau hnub ci zog cia, marine systems, thiab txhua qhov chaw lub neej ntev thiab kev nyab xeeb feem ntau.

NMChlwb ua haujlwm ntawm 3.6-3.7V nominal thiab xa cov zog ntau dua. Lawvtshem tawm nkhausmuaj qhov pom kev nqes hav, uas txhais tau hais tias qhov hluav taws xob poob qis dua li qhov muaj peev xwm siv. Qhov no ua rau NMC zoo dua rau cov ntawv thov uas xav tau cov zis hluav taws xob siab lossis qhov loj me, xws licuab yeej zogs, drones, thiab tej pob khoom EV.

Nov yog ib sab -los ntawm- sab piv:

Ntawm GEB peb tsim ob qho tib si chemistry thiab feem ntau pom zoo LFP thaum cov neeg siv khoom xav tau kev ntseeg siab ntev - lub sijhawm lub zog, thaum qhia NMC- raws li pob khoom thaum hnyav thiab lub zog ceev yog qhov tseem ceeb tshaj plaws.

Cov kev cuam tshuam rau kev siv tiag

Qhov hluav taws xobsag nyob rau hauv load, kub los, thiab aging tag nrho cov muaj feem xyuam rau ntau npaum li cas muaj peev xwm koj yuav tau rho tawm.

A 48V systemmuaj qhov pom tseeb zoo dua 24V lossis 12V rau tib lub zog tso zis. Vim tias tam sim no yog ib nrab, I²R poob poob qis heev - feem ntau los ntawm 30-40%. Kev them nyiaj kuj ua tiav sai dua thiab cov xaim tuaj yeem ua nyias. Rau lub zog loj cia lossis lub zog muaj zog, txav mus rau qhov hluav taws xob siab dua yuav luag txhua zaus txhim kho kev ua haujlwm.

Kev cia khoom tseem ceeb heev. Peb qhia kom khaws cov roj teeb lithium ntawm 40-60%SOCrau ntev - khaws cia. Feem ntau GEB hlwb xa khoom ntawm ib ncig ntawm 50% tus nqi vim tias qib no tau ua pov thawj zoo tshaj plaws rau kev txo qis hnub nyoog thaum ua kom rov zoo siab dua 98% txawm tias tom qab ib xyoos.

Tsis txhob txiav txim qhov muaj peev xwm ntxiv los ntawm qhov hluav taws xob ib leeg nyob rau hauv load. Nco ntsoov cia lub roj teeb so rau ob peb feeb thiab ntsuas OCV yog tias koj xav tau kev kwv yees ntxhib. Niaj hnubBMS unitsmuab qhov hluav taws xob, kev sib koom ua ke tam sim no (coulomb suav), thiab cov ntaub ntawv kub kom raug ntau duaSOCnyeem ntawv.

Kev xav zaum kawg

Qhov hluav taws xobqhia koj lub zog.Muaj peev xwmqhia koj tus nqi tag nrho. Kev ua tau zoo tiag tiag los ntawm qhov ob qhov no cuam tshuam li cas hauv koj qhov kev thauj khoom tshwj xeeb, qhov kub thiab txias, thiab lub voj voog ua haujlwm.

Tau txais qhov sib npaug ntawmvoltage platform, tag nrho muaj peev xwm, thiab chemistry yog dab tsi cais lub roj teeb zoo ntawm ib qho uas ua tsis tau zoo hauv thaj chaw. Ntawm GEB peb siv sijhawm ntau los ua kom zoo dua cov electrode piv, qhov rais qhov hluav taws xob, thiab cov khoom siv xaiv kom peb lub hlwb xa cov cwj pwm zoo sib xws thiab muaj peev xwm txhim khu kev ntseeg thoob plaws ntau pua lossis ntau txhiab lub voj voog.

Yog tias koj tab tom tsim lub kaw lus tshiab lossis ntsuas kev xaiv roj teeb, thov koj xav tiv tauj. Qhia rau peb koj qhov yuav tsum tau muaj voltage, lub sijhawm ua haujlwm, thiab kev ua haujlwm. Peb tuaj yeem pom zoo rau txoj cai chemistry thiab pob teeb tsa uas ua tau raws li koj daim ntawv thov tsis yog ua raws li cov lus qhia tshwj xeeb.